Access a textbox declared in App.xaml (WpfNotifyIcon Tooltip) from another window

Question

I am using WpfNotifyIcon, I have declared it as a resource like this:

<Application x:Class="NotifyIconScratchPad2.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:tb="http://www.hardcodet.net/taskbar" 
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <tb:TaskbarIcon x:Key="MyNotifyIcon" IconSource="Icons/stopwatch_start.ico" ToolTipText="Hello world" >
            <tb:TaskbarIcon.TrayToolTip>
                <TextBlock x:Name="ChangeThis" Text="Hello world"  />
            </tb:TaskbarIcon.TrayToolTip>
            </tb:TaskbarIcon>
    </Application.Resources>
</Application>

To use this, I declare it in MainWindow.xaml.cs:

    public TaskbarIcon tb;
    public Window1 myWindow;
    public MainWindow()
    {
        InitializeComponent();
        tb = (TaskbarIcon) FindResource("MyNotifyIcon");
    }

How can I access the textbox ChangeThis from another window?

I couldn't find the answer. I ended up declaring the notifyIcon in the Window itself and then accessing the TextBlock from there. — stirredo, Apr 03 '13 at 19:32

score 0 · Answer 1 · answered Apr 03 '13 at 16:24

0

The ultimate answer is setting up an event to do so.

The Model-View-View Model pattern is a good way to accomplish this.

Basically, you have a class that implements the INotifyPropertyChanged interface and a two-way data binding between both text boxes and the data source.

answered Apr 03 '13 at 16:24

Christopher Stevenson

2,843
20
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I am not familiar with MVVM, is there a way around it? Can you point me towards some sample code? Do I have to implement INotifyProperty in App.xaml.cs? – stirredo Apr 03 '13 at 16:28
1

It's a different way of working with Windows. I guess you're using the Code Behind file for most of your logic? – Christopher Stevenson Apr 03 '13 at 16:58
Yes, I am using code behind file. How would I do it if I was using data binding? Thanks for answering. – stirredo Apr 03 '13 at 17:01
I'll get an example together soon. – Christopher Stevenson Apr 03 '13 at 22:35

score 0 · Answer 2 · answered Apr 03 '13 at 16:39

0

you can use FindName method:

 TextBox txtToChange= tb.FindName("txt_ChangeThis") as TextBox;

answered Apr 03 '13 at 16:39

user1064519

2,180
12
13

When I do `TextBlock textBlock = tb.FindName("ChangeThis") as TextBlock;`, I am getting `null` back. It isn't working. Anything else I can do? – stirredo Apr 03 '13 at 16:45

Access a textbox declared in App.xaml (WpfNotifyIcon Tooltip) from another window

2 Answers2